Self-Management of multiservice network domains must include automatic
detection of service quality violations in order to perform appropriate
and timely responses, fostering the fulfillment of the service agreements
committed with customers, or other ISPs. As knowledge based systems are
capable of emulating human knowledge, they are presented here as convenient
tools to specify heuristics for QoS violation detection.

In this paper, the implementation of a service violation detection agent
is described and an illustrative scenario of its use is also presented.